Safe cut for a shaved head
A friend needs to pull a Zuk 1.3 head and is considering milling it to get higher compression. I did a search and saw that Sarge has a 0.020 shaved head. I also looked in the service manual, but it does not address milling the head.
Does anyone know the safe amount that a head can be shaved and what the limitation is? (i.e. pinging, valve interference, etc.)